skip to main content

Title: Energy dissipation by whistler turbulence: Three-dimensional particle-in-cell simulations

Three-dimensional particle-in-cell simulations of whistler turbulence are carried out on a collisionless, homogeneous, magnetized plasma model. The simulations use an initial ensemble of relatively long wavelength whistler modes and follow the temporal evolution of the fluctuations as they cascade into a broadband, anisotropic, turbulent spectrum at shorter wavelengths. For relatively small levels of the initial fluctuation energy ϵ{sub e}, linear collisionless damping provides most of the dissipation of the turbulence. But as ϵ{sub e} and the total dissipation increase, linear damping becomes less important and, especially at β{sub e} ≪ 1, nonlinear processes become stronger. The PDFs and kurtoses of the magnetic field increments in the simulations suggest that intermittency in whistler turbulence generally increases with increasing ϵ{sub e} and β{sub e}. Correlation coefficient calculations imply that the current structure dissipation also increases with increasing ϵ{sub e} and β{sub e}, and that the nonlinear dissipation processes in these simulations are primarily associated with regions of localized current structures.
Authors:
 [1] ;  [2] ;  [3]
  1. Oracle Corporation, Redwood City, California 94065 (United States)
  2. Space Science Institute, Boulder, Colorado (United States)
  3. University of Southern California, Los Angeles, California (United States)
Publication Date:
OSTI Identifier:
22252867
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANISOTROPY; DAMPING; ENERGY LOSSES; FLUCTUATIONS; MAGNETIC FIELDS; NONLINEAR PROBLEMS; PLASMA; SIMULATION; THREE-DIMENSIONAL CALCULATIONS; TURBULENCE; WAVELENGTHS; WHISTLER INSTABILITY; WHISTLERS